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The results of the study of the morphometric parameters of eggs and prelarvae of the Alaska plaice Pleuronectes quadrituberculatus in the northern part of the Sea of Okhotsk are presented. Incubation of eggs of the species from natural spawning collected in June 2021 was carried out. The diameter of eggs of the Alaska plaice ranges from 1.60 to 1.93 mm (on average, 1.75 mm). The results of our research in the northern part of the Sea of Okhotsk briefly supplement the information available in the literature on the parameters of the eggs and the morphology of the prelarvae of the Alaska plaice. The total length (TL) of newly hatched prelarvae of P. quadrituberculatus is equal to 6.48 mm with fluctuations of 5.70–7.25 mm. The general morphology of embryos and prelarvae of the Alaska place coincide with the descriptions available in the literature. At the same time, in those described by us, along with the pigmentation of the body with black melanophores, yellow pigment cells develop. The prelarvae of the Alaska plaice of the area studied differ from their peers in other areas by their large size and differentiated digestive tract. This paper presents for the first time photos of embryos and prelarvae of P. quadrituberculatus in the living state. Analysis of the levels and stages of development of Alaska plaice eggs suggests that, in the northern part of the Sea of Okhotsk, mass spawning of the species occurs in April and early May. [ABSTRACT FROM AUTHOR]